Protozoa are fungi: Protozoa are fungi belong to different Kingdoms.
Penicillin: Alexander Fleming discovered Penicillin. Penicillin is derived from molds. Penicillium is a mold, which are members of the Kindgom Fungi.
Archaea: A part of the basic definition of members of the Domain Archaea is the difference in the cell walls when compared to Bacteria. Archaea can be differentiated from Bacteria by the fact that Archaea have cell walls composed of pseudomurein.
Bacteria: Bacteria are prokaryotes. The word prokaryote means before or pre-nucleus. Their DNA is not contained by a membrane and is referred to as a nucleoid region of the cell. Peptidoglycan is the carbohydrate that composes the cell wall of bacteria, differentiating these organisms from Archaea, fungi, plants, and algae. While bacteria lack a true nucleus, the cellular structures that they have in common with eukaryotes is ribosomes. Bacteria must make proteins for growth and maintenance; this is accomplished with ribosomes. Bacteria are microscopic and generally fall in the size range of 1-3 um, although there are some exceptions. “Strepto” refers to bacterial cells arranged in chains; cocci is a reference to morphology.